CWMS 3.4.1 is a patch release of CWMS 3.4.0 that is required to allow users to save, modify, and extend ratings from CWMS-Vue.

  • No other features were changed between CWMS 3.4.0 and CWMS 3.4.1, and CWMS 3.4.1 includes the same modeling software as CWMS 3.4.0.
  • If users have already upgraded to CWMS 3.4.0, simply replace the CWMS 3.4.0 Client Package with CWMS 3.4.1
  • Users can simply skip CWMS 3.4.0 and upgrade from CWMS 3.3.1 directly to CWMS 3.4.1


CWMS is a collection of software designed and assembled to assist Corps of Engineers water managers in making decisions regarding the release or storage of water and the operation of the various projects throughout their area of responsibility. This collection of software is separated into three groups: Client Software, Modeling Software, and Server and Database Software. The Client and Modeling Software are combined into a single CWMS Client package for installation on your PC. The Server and Database software are assembled into a separate package for installation on your CWMS Server.

The CWMS Release Notes explain changes to CWMS from the previous version. Older versions of this page can be accessed by clicking the drop-down in the top right corner of this page. Please contact the CWMS team at HEC for additional assistance.

CWMS 3.4.1 includes the following modeling client software versions:

Convert Files to DSS7

Before forecasting using CWMS 3.4.1, please follow the steps here to convert your DSS files from DSS6 to DSS7.


Planned Retirement of Tools in the Future

Post CWMS 3.4.1, the following programs will be retired and will no longer be a part of the CAVI/RTS software package in future CWMS releases:

  • MFP
  • DataExchange